Changed SchematicLoader to use DDLoot.DungeonChestInfo instead of
requesting a reference to the same data through ChestGenHooks. Exactly
the same data is being retrieved, but ChestGenHooks retrieves it by
performing a lookup on a map relating loot categories to loot info, so
it's slightly slower. No point in doing that if we have access to the
reference directly.
4c23e5c7b8